Most accurate 100% intuitive digital GPS speedometer app for your Car, Bike, Bus, Van, Jeep, Bicycle, truck, Air Plane, drone, chair lift, Motorboat, Skiing and walking or running. Measure in five different scales km/h, mph, mps, Knots, ft/s. No matter you are driving reverse or forward just get most accurate speed in your desired scale based on your device GPS sensor.